How to make the Camera rotate more than one time?
Double turn around a circular path -



Add a curve --> circle.  Set your total frames in the timeline to say 250.

In the path's geometry properties, set the "Frames" to 200.

At frame 1 keyframe the path's Evaluation time" which should be showing 0.000 

Take the timeline cursor to (e,g,) frame 240.

In the Path's properties, set it's "Evaluation" time to twice that in the 'Frames' slot. (400) and  keyframe that.



Set an empty or other object to follow the path.